33420391 has 2 divisors, whose sum is σ = 33420392. Its totient is φ = 33420390.

The previous prime is 33420389. The next prime is 33420407. The reversal of 33420391 is 19302433.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 33420391 - 2¹ = 33420389 is a prime.

It is a super-2 number, since 2×33420391² = 2233845069185762, which contains 22 as substring.

Together with 33420389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33420991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16710195 + 16710196.

It is an arithmetic number, because the mean of its divisors is an integer number (16710196).

Almost surely, 2^33420391 is an apocalyptic number.

33420391 is a deficient number, since it is larger than the sum of its proper divisors (1).

33420391 is an equidigital number, since it uses as much as digits as its factorization.

33420391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 33420391 is about 5781.0371906778. The cubic root of 33420391 is about 322.1097288159.

The spelling of 33420391 in words is "thirty-three million, four hundred twenty thousand, three hundred ninety-one".